The application of photoelectrocatalysis in the degradation of rhodamine B in aqueous solutions: a review

Abstract

The pollution of the water environment by industrial effluents is an ongoing challenge due to the rate of industrialisation and globalisation.

Impact on the Photocatalytic Dye Degradation of Morphology and Annealing-Induced Defects in Zinc Oxide Nanostructures

“…It is a well-known fact that the photocatalytic activity of ZnO depends on its surface properties. ,, Therefore, ZnO nanopowders with different morphology and defect properties were used in the photocatalytic degradation of the RhB organic dye, a water-soluble fluorescent xanthene dye used to dye various materials. Due to its toxicity, much effort has been paid to remove or depredate RhB into harmless species. − Five mg of ZnO nanopowder was dispersed in 10 mL of dye solution. The changes in the optical absorption spectra in time were recorded (Figure S7) to understand the effect of the morphology and defects on the photocatalytic degradation of RhB; Figures A–E compare the RhB degradation performance of ZnO NS, NF, and NU annealed at 300 °C under atmospheric conditions.…”

Synthesis of copper–silver–zinc oxide nanocomposites for 4-nitrophenol reduction: doping and heterojunction

“…The charge transfer process reduces electron-hole recombination, which is critical for several applications, such as catalysis and photocatalysis. 10 The coupling of noble metals such as silver allows for light-matter interaction, which improves visible light absorption and charge transfer properties due to the formation of a Schottky barrier. Forming a heterojunction between ZnO and CuO also assists the charge transfer process within the interface 5,11 Recently, some silver and copper doped ZnO NCs works were reported.…”

Mesoporous transition metal oxides for oxygen electrocatalysis in energy conversion technologies

“…Therefore, it has been used as oxidant in advanced oxidation processes, e.g., degradation of organic pollutants and water treatment [18][19][20]. Conventionally, the hydroxyl radical and other reactive oxygen species have been widely studied in photocatalysis using semiconductor materials, e.g., TiO2, ZnO, BiVO4 etcetera [21,22]. However, generation of 𝑂𝐻 • via electrocatalysis oxygen has been rarely reported [20].…”